Electrolyte and lithium ion battery containing same

An electrolyte and lithium salt technology, applied in the field of lithium-ion batteries, can solve the problems of poor low-temperature charge-discharge performance, poor cycle life, and difficulty in ensuring low-temperature charge-discharge rate performance of batteries.

Active Publication Date: 2017-02-15
NINGDE AMPEREX TECH
View PDF6 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned schemes will lead to a series of problems such as poor electrochemical performance of lithium-ion batteries, such as high-temperature storage performance, low-temperature charge-discharge performance, and cycle life.
[0004] According to the patent report, the technology of improving the chain carbonate dimer, chain carboxylate dimer, chain sulfonate dimer or phosphate ester can improve the high temperature storage performance and cycle performance of the battery, but With higher and higher energy density, it is difficult to guarantee good low-temperature charge and discharge and rate performance of the battery only by the above.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Electrolyte and lithium ion battery containing same
  • Electrolyte and lithium ion battery containing same
  • Electrolyte and lithium ion battery containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] The preparation of embodiment 1 lithium ion battery

[0123] In Comparative Examples 1# to 10# and Examples 1 to 36, lithium ion batteries (hereinafter referred to as batteries) were prepared according to the following method:

[0124] (1) Preparation of electrolyte

[0125] In an argon atmosphere glove box with a water content <10ppm, mix ethylene carbonate (EC) and ethyl methyl carbonate (EMC) that have been rectified, dehydrated and purified at a volume ratio of 30:70, and fully dry lithium salt Dissolve in the above-mentioned mixed organic solvent, then add additives into the organic solvent, and mix uniformly to obtain an electrolyte solution. Wherein, the concentration of the lithium salt is 1 mol / L.

[0126] (2) Preparation of positive pole piece

[0127] Lithium cobalt oxide (LiCoO 2 ) positive electrode active material, binder (PVDF), and conductive agent (acetylene black) are mixed according to the mass ratio of 98:1:1, N-methylpyrrolidone (NMP) solvent is...

Embodiment 2

[0160] The electrolyte is prepared by the method in Example 1, the difference is that the formula of the electrolyte is as shown in Table 4; wherein, the lithium salt is 1M LiPF 6 , the content of the additive is the percentage by weight calculated based on the total weight of the electrolyte;

[0161] Table 4: Electrolyte formulation

[0162]

[0163]

[0164] The lithium-ion battery was prepared by using the electrolyte in Table 4, and the properties of the prepared lithium-ion battery were similar to those of Example 1, and will not be repeated due to space limitations.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to the technical field of a lithium ion battery, in particular to an electrolyte and a lithium ion battery containing the same. The electrolyte disclosed by the invention comprises a lithium salt, an organic solvent and an additive, wherein the additive contains a bipolyester compound and a sulphate compound, the bipolyester compound comprises a carbonic bipolymer, a carboxylic biopolymer and a sultone biopolymer, and the sulphate compound comprises an annular sulphate compound and a straight-chain or branch-chain sulphate compound. The bipolyester compound can be used for effectively forming a film at a positive electrode and preventing an electrolyte from being oxidized at the positive electrode, so that the high-temperature performance and the cycle performance of the battery are effectively improved; and the sulphate compound can be used for preventing the bipolyester compound from being reduced at a negative electrode, so that the battery acquire favorable low-temperature charge-discharge performance and rate performance, and the cycle performance of the battery can also be improved.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular, to an electrolyte and a lithium-ion battery containing the electrolyte. Background technique [0002] Lithium-ion batteries have significant advantages such as high specific energy, high specific power, long cycle life, and low self-discharge, and have been widely used in electronic products such as mobile communications, digital cameras, and video cameras. It is precisely because lithium-ion batteries have the above-mentioned remarkable advantages that lithium-ion batteries have become a hot spot in the development of energy storage and power batteries. However, with the wide application of lithium-ion batteries, higher requirements are put forward for the environmental adaptability of lithium-ion batteries, so that lithium-ion batteries are used in various environments; in addition, as lithium-ion batteries become smaller With the development of moderniza...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/058
CPCH01M10/0525H01M10/0567H01M10/058Y02E60/10Y02P70/50
Inventor 陈培培周艳付成华唐超张明
Owner NINGDE AMPEREX TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap